- Water Requirement Criterion (as notified by the Government): Unless otherwise specified in Annexure B, water requirement for fire fighting in different categories of occupancies shall be based on following.
| Occupancy Category | Sprinkler Design Discharge Density (lt./min/Sq.m) | Sprinkler Design Area (Sq.m) | Max. area coverage/ Sprinkler (Sq.m) | No. of House Streams* Fully other Sprinkled | Duration of Discharge (Min.) | |
| Fully Sprinkled | Wet Riser Sprinkled | |||||
| LEVEL-I | 02.5 | 084 | 21 | 24 | 45 | 45 |
| LEVEL-II | 05.0 | 360 | 12 | 36 | 60 | 90 |
| LEVEL-III | 10.0 | 225 | 09 | 36 | 90 | 90 |
Note: The discharge through a standard hose stream shall be taken as 567 lt./min.
- Estimation of Total Water Requirements Fully Sprinklered Buildings (as notified by the Government)
| Occupancy Category | Sprinkler(lt.) | Riser(lt.) | Total(lt.) | Wet Riser cum Down Comer (lt.) |
|---|---|---|---|---|
| LEVEL-I | 9,450 | 51,030 | 60,480(60,000) | 1,02060(1,00,000) |
| LEVEL-II | 1,08,000 | 1,02,060 | 2,10,060(2,00,000) | 2,04,120(2,00,000) |
| LEVEL-III | 2,02,500 | 1,02,060 | 3,04,560(3,00,000) | 3,06,180(3,00,000) |
3. Water Storage Tanks (as notified by the Government)
(1) The design of the water storage tanks shall be as laid down in National Building Code of India.
(2) The capacity of underground water storage tank shall not be more than85% of the total water requirement.
(3) The capacity of overhead tank shall not be less than 15% of the total water requirement.
(4) The entire water requirement can be provided in overhead tanks and pumping requirements shall be finalized in consultation with Chie Fire Officer.
(5) Under ground water storage tank shall not be provided in the set back areas.
| Occupancy Category | Under Ground Static Tank | Over Head Tank | ||
| Fully Spkd. (lt.) | Riser (lt.) | Fully Spkd.(lt.) | Riser(lt.) | |
| LEVEL-I | 50,000 | 85,000 | 10,000 | 15,000 |
| LEVEL-II | 1,70,000 | 1,70,000 | 30,000 | 30,000 |
| LEVEL-III | 2,50,000 | 2,50,000 | 50,000 | 50,000 |
4. Riser/Down comer (as notified by the Government)
(1) The size of the riser/ down comer shall be such that velocity of flow does not exceed 5 m/second subject to a minimum of 100mm diameter.
(2) The number of riser/down comer shall be calculated on the basis that if 30m of delivery hose is laid, it reaches the farthest comer of the remotest compartment on the floor.
(3) The riser/down comer shall be provided in the staircase/staircase lobby in such a manner that it does not obstruct the means of escape.
(4) Only single headed hydrants shall be used on the riser/down comer.
(5) The size of hose to be provided with the internal hydrants shall be 50mm diameter and with 63 mm diameter instantaneous male/female couplings.
(6) Diffuser branch shall only be provided in the hose boxes.
(7) In case of partially sprinklered building tapping from the wet riser is permitted for sprinkler feed.
(8) In case of fully sprinklered building separate rising mains and pumps shall be used for sprinkler system and wet riser.
Selection of Pumps (as notified by the Government)
(1) Pumping requirement shall be met by a single pump or combination of pumps.
(2) If more than one pump is installed to meet the pumping requirement they shall be so arranged that they come into operation one after another depending upon fall in pressure in the mains and the combined pumping capacity shall be 20% more than the actual pumping capacity needed.
(3) Jockey pump shall be selected to give minimum 3% and maximum 5% of aggregate pumping requirement at the same pressure to that of the main pump subject to maximum discharge of 450 LPM.
(4) Standard pumps shall only be used having discharge capacity as 180LPM, 2280LPM 2850 LPM and 4550 LPM.
(5) The pump shall be capable of giving the pressure as shown in the table below:
| Occupancy Category | Pressure* At Terrace Level | |
| Fully Spkd. (Kgf./Cm2) | Riser (Kgf./Cm2) | |
| LEVEL-I | 3.5 | 3.5 |
| LEVEL-II | 3.5 | 5.5 |
| LEVEL-III | 3.5 | 7.0 |
* Orifice plates shall be installed at the hydrants on rising mains/yard hydrants to ensure that the pressure does not exceed 7 Kgf/Cm2
(6) Manual for Fire and Life Safety Measures. (as notified by the Government)